Electromagnetic motor



May 16, 1933. E ROSE 1,909,425

ELECTROMAGNET IC MOTOR Filed May 27, 1931 l llllllllllllllll EL; E 31a/vento@ fau/ln L. Rose Patented May 16, 1933 lUMTED STATES PATENT OFFICE t 'EDWIN L. ROSE, OF CAMBRIDGE, MASSACHUSETTS, ASSIGNOR TO DAHLSTROMMETALLIC DOOR COMPANY, OF JAMESTOWN, NEW YORK, A CORPORATION OF NEW YORK IELECTROMAGNETIC MOTOR Application :filed May 27,

This invention relates to an improvement in an electro-magnetic motor and more particularly to one adaptable for use in actuating one or more sliding doors. i The preferred embodiment of this invention is directed to the provision of an electromagnetic motor operated on direct current. While it may be possible to alter the wind- M,ings of certain of the coils in this device to 'permit use with alternating current, it has been found that direct current produces more satisfactory results with the structure hereinafter described. rlhe device is comprised of relatively liXed and movable coils, VN"which, when energized from a suitable source of current supply, set up magnetic iields, the attraction or repulsion of which is utilizled 'to operate one or more closure doors. D The structure of this invention includes sets of fixed and movable coils energized by direct connection with a current supply.

The principal object of the invention is to provide an electro-magnetic motor by which to` l produce a reciprocating translatory 25` motion.

Another object of the invention is to provide a motor of this class in conjunction with and adapted to actuate one or more sliding doors. j

"' 'A further object of the invention lies in the provision of a. motor of this class, the adaptability of which is such that through alteration of ampere turns of the coils, variable' speed and force may be had by which to motivate a door.

Other and further objects of the invention will appear from a consideration of the following specification which is taken in conjunction with the accompanying drawing,

and in which Fig. 1 is a rear elevation of one modiiication of this invention, showing the connections necessary for operating a pair of sliding doors;`

' 45 Fig. 2fshows' a slight modification of the 1931. Serial No. 540,355.

structure in Figure 1, having an additional fixed coil g* Fig. 3 is an enlarged vertical sectional view taken on the line 3 3 of Figure 2 and shows means by which the movable coil is coupled with a door;

Fig. 4 is an enlarged fragmentary elevation further showing the,coupling between one of the movable coils and a door hanger; an

Figs. 5 and 6 are diagrams of the current supply connections for the modifications of Figures l and 2 respectively.

Referring to the drawing and particularly to Figure 1, the invention is shown mounted for use upon an entrance enclosure generally indicated by the reference numeral 10. Supported by brackets 12, on one vertical face of the enclosure, are coils 13 and 14. A rod 16, formed from a non-magnetic metal terminates in and is supported at its ends i by coils 13 and 14. Encircling the rod 16 are two movable coils 20 and 21. Although these coils may contact with the rod 16, their weight .will be sustained through a structure about to be described. Encircling the Acoils 20 and 21 are straps 22, the iianges 23 and 24 of which are joined together by screws 25. Flange 24 projects below flange 23 and engages a shoe 26. The shoe 26 is engaged with a bracket 27 by means of removable pins 28. The bracket 27 is bolted or otherwise suitably mounted on a door hanger 28a from which is suspended a door 29. The hanger 28a supports rollers 3() which are mounted on a track 31 secured to the enclosure 10. Since the door 29 and attendant supporting structure forms no part of this invention, further description thereof is unnecessary.

The operation of. the modification described above is as follows. Assuming doors 29 to be closed substantially Vas shown. `in Figure 1, opening them is accomplished .by throwin the switch 32, shown in the dia.- gram o Figure 5, upwardly. With tbfe. 20

switch in this position, the movable coils 20 and 21 are energized from a suitable source of current supply and in a manner such that the adjacent pole faces are of like polarity and for the purpose of illustration may be considered as having a positive polarity. The end coils 13 and 14, through a jumper ar ranged on the switch 32, are connected with the source of current supply in a manner such as to cause their inner pole faces to have a positive polarity. Since it is a fundamental principle in electro-magnetic circuits that like poles repel and unlike poles attract, coils 20 and 21 will repel each other and move apart. Simultaneously with the repellent force set up by coils 20 and 21, an attracting force will be exerted by the end coils on the adjacent movable coil. For example, the inner pole face of coil 13, being of opposite polarity to the adjacent pole face of coil 20, will attract said coil and in a like manner coil 14 will attract coil 21. A dual force is therefore acting to move the coils 20 and 2l toward and into proximity with coils 13 and 14. Thus doors 29 are opened.

To return the doors to closed position, the switch 32 is moved downwardly. This reverses the polarity of the coils 14 and 20, thus the adjacent pole faces of coils 13 and 20 will be of like polarity and the adjacent pole faces of 14 and 21 also of like polarity, with the adjacent pole faces of coils 20 and 21 of unlike polarity. This causes a repelling force to be set up between the adjacent fixed and movable coils and an attracting force as between the movable coils. The combination of these forces moves the doors from opened to closed position.

Referring to Figure 2, a modification of the above described invention is shown in which an auxiliary or booster coil 33 is provided. The additional coil is supported on the enclosure 1() by brackets 34. This coil receives and supports the central portion of rod 16. By means of this coil the rod is divided into two elements, namely, 35 and 36, coil 2O being mounted on element 35 and coil 21 on element 36.

The operation of this modification may be more clearly understood by referring to the diagram of Figure 6. Assuming it is desired to open the doors, switch 37 is thrown to the right. This causes current to flow through all of the coils in a direction such that the adjacent pole faces of coils 13 and 20 are of unlike polarity and the adjacent pole faces of coils 20 and 33 are of like polarity. The adjacent pole face of coils 14 and 21 are of unlike polarity whereas the adjacent pole faces of coils 21 and 33 are of like polarity. The magnetic force set up between each of the movable coils and the fixed coil repels said movable coils causing them to move toward the end coils which, by reason of their magnetic fields, attract said movable coils.

To close the doors the switch 37 is thrown to the left. This reverses the direction of current flowing through coils 20 and 21 with a consequent reversal of polarity. Thus coil 2O will be repelled from coil 13 and attracted to coil 33 and coil 21 repelled from coil 14 and attracted to coil 33. The resultant magnetic forces established, as above described, will move the doors from opened to closed position.

While applicant has shown and described but two modifications of an electro-magnetic translating motor for use with direct current, it is obvious that other modifications of this invention may be made without departing from the spirit and scope Vof the invention as defined in the hereunto annexed claims.

I-Iaving thus set forth my invention what I claim as new and for which I desire protection by Letters Patent is:

1. A rectilinear electro-magnetic motor for operating an enclosure door comprising a rod,

coils engaged with the ends of and supporting said rod, brackets joined to and mounting said coils and said rod on a door enclosure, an armature coil loosely mounted on said rod, a strap secured to and projecting outwardly from said armature coil, a door hanger, and means connecting said strap with said hanger, said means permitting movement of said armature coil perpendicular to its direction of travel, a source of direct current supply, Contact means adapted to simultaneously connect all of said coils to sai-d supply whereby to produce an attractive or repulsive action between said armature and one of said coils.

2. A rectilinear electro-magnetic motor for operating bi-parting doors comprising a rod, a pair of fixed coils engaging the ends of and supporting said rod, a pair of armature coils loosely mounted on said rod, straps secured to and projecting from said armature coils, supporting hangers, doors depending from said hangers, means connecting said straps with said hangers, a source of direct current supply, contact means adapted to Simultaneously connect all of said coils to said supply whereby to produce an attractive 'or repulsive action between said armatures and said coils and cause said doors to move in opposite directions.

3. In a rectilinear electro-magnetic motor for operating bi-parting doors, a guide rod, coils engaged with the ends of and supporting said rod, brackets mounting said coils on a door enclosure, two armature coils loosely mounted on said rod, said armature coils being movable axially of said rod toward or away from each other, doors, hangers connected with and supporting said doors, and vertically extendable means connecting said armature coils with said doors.

4. In a rectilinear electro-magnetic motor, a rod, coils engaged with the ends of and sup- WI 51H,

porting said rod, reversely directional reciprocating means mounted on said rod, said means comprising two armature coils loosely encircling said rod, a source of direct current 5 supply, contact means adapted to simultaneously connect said coils and said armatures to said current supply whereby to produce an attractive or repulsive action between said armatures and said coils.

5. In a rectilinear electro-magnetic motor for operating a sliding door, a hanger engaged with said door, a bracket mounted on said hanger, a coil supported rod, an armature coil mounted on said rod, a strap dependingfrom said armature coil and verti-v cally yieldably connected with said hanger bracket whereby to compensate for any variation in horizontal alignment between the line of travel of said' door and the direction of said rod, a source of direct current supply and contact means adapted to connect said armatures to said supply to cause an attracting or repelling action between said armature and said coils. 6. A rectilinear electro-magnetic motor comprising a plurality of spaced fixed coils, a `roel supported by said coils, armatures mounted on said rod between adjacent coils, a source of direct current supply, and contact mea-ns adapted to simultaneously connect said coils and said armatures to said supply whereby to cause a repelling or attracting .action between said armatures and said coils. 7. A rectilinear electro-magnetic motor comprising a plurality of spaced fixed coils, a rod supported by said coils, armatures mounted' on said rod between adjacent coils, a direct current supply source, a reversing l40 switch adapted to simultaneously connect said coils and armatures with said current supply whereby to cause a repelling or an attracting action bet-Ween said armatures and said coils.

v 8. In a rectilinear electro-magnetic motor for operating a sliding door, a hanger engaged with said door, a bracket mounted on said hanger, a rod, Xed coils supporting the ends of said rod, an armature coil mounted on said rod between said fixed coils, a strap depending from said armature coil, said strap being yieldably connected with said hanger bracket whereby to compensate for any variation in horizontal and/or vertical alignment between the line of travel of said door and the Vdirection of said rod.

In testimony whereof I have affixed' my signature.

EDWIN L. ROSE. 60 

